Show allow_override key example in docs

Author: Tamerz

REFERENCE.md

@@ -10157,6 +10157,11 @@ apache::vhost { 'files.example.net':
       'provider' => 'files',
       'deny'     => 'from all',
     },
+    { 'path'           => '/var/www/html',
+      'provider'       => 'directory',
+      'options'        => ['-Indexes'],
+      'allow_override' => ['All'],
+    },
   ],
 }
 ```

manifests/vhost.pp

@@ -1360,6 +1360,11 @@
 #         'provider' => 'files',
 #         'deny'     => 'from all',
 #       },
+#       { 'path'           => '/var/www/html',
+#         'provider'       => 'directory',
+#         'options'        => ['-Indexes'],
+#         'allow_override' => ['All'],
+#       },
 #     ],
 #   }
 #   ```